Which of the following choices is a biotic factor in the ecosystem?

sunlight,

water,

deer,

soil

Deer

Explanation:

A biotic factor is something that is living. For example, a plant or an animal is a biotic factor.

Water, sunlight and soil are not alive. They are all examples for abiotic factors, or things that aren't living.

Deer are animals and they are alive. Therefore, the biotic factor is a deer.

Deer because it is a biotic factor since it's living unlike the rest are abiotic and non living